Derby contenders

Kingston Hill ridden by Andrea Atzeni led Exchequer ridden by Richard Hughes to win at Newbury Racecourse in September last year (Image: Action Images/Julian Herbert)1 of 8

The Irish trainer Aidan O'Brien pictured at the Future Champions Day at Newmarket in October 2013. He trains three well-backed colts in the Derby - Australia, Geoffrey Chaucer and Orchestra (Image: Action Images/Julian Herbert)2 of 8

Western Hymn ridden by William Buick on the way to victory at Newbury Racecourse (Image: David Davies/Press Association Images)3 of 8

Fascinating Rock ridden by Pat Smullen (left) goes on to win The Bulmers Live At Leopardstown in Dublin (Image: Artur Widak/Press Association Images)4 of 8

True Story ridden by Kieren Fallon heads to the start of the Betfred Dante Stakes at York (Image: Action Images/Julian Herbert)7 of 8

Joseph O'Brien pictured after winning the Dubai Dewhurst Stakes on War Command at Newmarket in October last year. He is aiming to win his second Derby on Australia (Image: Action Images/Julian Herbert)8 of 8